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Author
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Topic: Filming the cpu screen
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skippy
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posted 02-06-2000 04:54 PM
in this new movie i'm working on, i need to film the computer screen but whenever i do, the camera shows the lines going down the screen every second. it comes out looking really crappy. is there anyway to prevent the lines from showing up either while editing or filming. thanx. |
funkymunkey
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posted 02-06-2000 05:04 PM
If you film at a shutter below 1/60 of a second you can usually get rid of the scan lines. If you camera's shutter is automatic, you're out of luck.  |
JBPro
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posted 02-06-2000 05:15 PM
if you're shooting it at 1/60th make sure your computer monitor's refresh rate is 60hz so that they're both aligned properly. |
NJRFilms
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posted 02-06-2000 05:33 PM
No refresh rate works on with my camera.
ANd before someone asks right click your desktop, click proporties, select settings, select advanced and its there, different depending on ur display adapter.
Anyway I tried all refresh rates and non worked.
[This message has been edited by NJRFilms (edited 02-06-2000).] |
Skinned Fox
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posted 02-06-2000 11:05 PM
Shutter 1/60 speed means the camera's shutter is open for 1/60th of a second. It still films at twenty four frames a second. A computer monitor set at 60hz sweeps it's cathode ray across the screen 60 times a second. These two settings are unrelated. You can set the refresh rate till you die and it won't mean jack. A refresh rate of 24hz will (in theory, didn't test it) just make a solid black line instead of a moving one on the monitor A shutter speed of 1/60 will help because it will allow the film to be exposed to all the lightcoming from the monitor. For maximum exposure I suggest the highest refresh rate on the monitor. ------------------
These are strange and beautiful days my brothers, strange and beautiful days!
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JBPro
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posted 02-07-2000 12:26 AM
That's assuming you're shooting on film and assuming the camera is set at 24fps. I was referring to shooting a screen at 1/60th at 30fps with a video camera, not a film camera. I just based that setting on my personal experience. I've shot monitors before and 60hz worked for me. Just so you know, you will not get any black bars or any lines on a monitor if you shot it with a film camera.(no matter what the shutter rate is.) That's because every frame is being exposed and not being captured electronically. The same goes for shooting a TV with a film camera. |
DackL
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posted 02-07-2000 12:54 AM
On my camera, a Sony Digital8, making the shutter speed slower will help things tremendously. There is a Slow Shutter option in Digital Effects, if you have a camera like mine. |
Critter
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posted 02-07-2000 07:35 AM
There are video cameras tht will allow you to adjust the scan rate, which is what you need. The bad thing is, these are cameras that cost over 5 grand, usually much more.------------------
Rex Winfrey
Critter Creation Shop
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IR-Baboon
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posted 02-07-2000 03:26 PM
There are all sorts of cameras and gadgets avalible... But all cost huge amounts...One of the things that made the Amiga such a common site on TV production was its ability to run in 15hz and because of its good cheap genocks... You see the Amiga will retime all its internal clocks to the timing of the video connected to the genlock... so by default if the video source was the camera shooting the screen the computer would write a scanline at the same time the camera recorded it... this meant absolutly stable computer screens on camera in the early nineties... Now there used to be some PC genocks on the market in the mid nineties... there may still be some around.. and some second hand. You may have a LOT of trouble with your monitor as it will be scanning at 31hz to 80hz depending on monitor settings... this may not efect the camera, but I will assume it will. SOLUTION... most genlocks allow a video monitor out... so hide your computer monitor behind the desk for filming and set up a small TV screen discuised as a computer monitor... of course this will be the video monitor on the video out from your genlock... you could look for a cheap second hand 1084s Amiga monitor (they are full video monitors that looked like 14 inch computer monitors for the Amiga computers)... the 1084s monitors sell second hand for as little as $10 US (thats how much I payed for my last one). I hope this helps... in all probability it will work... and its far cheaper than the alternatives... OH and you might learn something about video standards while your at it |
funkymunkey
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posted 02-07-2000 03:42 PM
Yeah, there was a really good Sony Betacam I saw that could hit shutters from 1/60 to 1/200.5 second in 255 steps. It was specially suited for productions that involved filming computer screens (i.e. Corporate Training Films). The only problem was it cost $17,000 just for the camera, you still had to buy the recorder on top of that. |
dead_body_#ONE
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posted 02-07-2000 05:11 PM
Ebay still has some good genlocks and old Amiga's but Gompaq is releasing a new line of Amiga computers sometime this year. Hopefully they will be as good as the old ones. |
IR-Baboon
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posted 02-08-2000 03:50 PM
dead_body_#ONEI tried to fit my explination to the PC... I am assuming that he is wanting to show something on a PC OS either in the background or as a short closeup. He may not want to go to the trouble of faking an OS in DPaint etc... And new Amigas may not be a good idea. Any new Amiga will have 50hz + refresh rate too. Leaving the end user in the same situation of connecting the genlock and 15hz monitor and then hiding the usual SVGA/mutisync monitor. |
skippy
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posted 02-08-2000 04:13 PM
yea, i don't really want to buy anything (i'm too cheap). i'm only planning on shooting a short close up (10 seconds max) and a view from like 5 feet away for no more then a few minutes. thanx for all the ideas. |
